The **FSLM2520-R18-J** is a high-frequency, surface-mount (SMD) inductor manufactured by **TDK Corporation**. It belongs to the FSLM series, which is specifically designed for high-frequency circuits and general signal processing. --- ### 1. Part Number Breakdown Understanding the alphanumeric code explains the component's core specifications: | Part Segment | Meaning | Detail | | :--- | :--- | :--- | | **FSLM** | Series Name | Wire-wound inductor for signal lines | | **2520** | Case Size | 2.5mm x 2.0mm (Metric) / 1008 (Imperial) | | **R18** | Inductance Value | 0.18 µH (180 nH) | | **J** | Tolerance | ±5% | --- ### 2. Technical Specifications Below are the electrical and physical characteristics typical for this specific model: | Parameter | Value | | :--- | :--- | | **Inductance** | 0.18 µH | | **Tolerance** | ±5% | | **DC Resistance (DCR)** | 0.45 Ω (Max) | | **Rated Current** | 430 mA (Typical) | | **Self-Resonant Frequency (SRF)** | 400 MHz (Minimum) | | **Q Factor (Minimum)** | 25 (at 25.2 MHz) | | **Operating Temperature** | -40°C to +85°C | --- ### 3. Key Features & Construction * **Wire-wound Structure:** Uses a miniature wire-wound core to achieve higher Q factors (quality factor) compared to multilayer inductors. * **Resin Molded:** The part is encapsulated in a resin mold, providing excellent physical durability and resistance to environmental factors during the soldering process. * **Magnetic Shielding:** While the FSLM series is generally unshielded, the molded body provides a degree of protection against mechanical stress. --- ### 4. Typical Applications The FSLM2520 series is commonly found in communication and consumer electronics: 1. **RF Circuits:** Used in matching circuits for wireless communication modules. 2. **Signal Filtering:** High-frequency noise suppression in video and audio signal lines. 3. **Mobile Devices:** Due to its small footprint (2520), it is ideal for smartphones and tablets. 4. **Tuning:** Used in resonance circuits for FM/AM or clock oscillators. --- ### 5. Soldering & Handling * **Reflow Profile:** Compatible with lead-free soldering (Pb-free). * **Storage:** Should be kept in a controlled environment to prevent terminal oxidation.